访问bash脚本中的变量

In the bash command line, I set a variable myPath=/home/user/dir . I created a script in which I put echo $myPath but it doesnt seem to work. It echoes nothing. What can I do to access the myPath variable in the script. If I write echo $myPath in the command, it works, but not in the script.

在bash命令行中,我设置了一个变量myPath = / home / user / dir。我创建了一个脚本,我在其中放置了echo $ myPath,但它似乎没有用。它没有回音。如何在脚本中访问myPath变量。如果我在命令中编写echo $ myPath,它可以工作,但不在脚本中。

4 个解决方案

#1

Try

export myPath=/home/user/dir

#2

how did you assign the variable? it should have been:

你是如何分配变量的?应该是:

$ export myPath="/home/user/dir"

then inside a shell program like:

然后在shell程序中,如:

#!/usr/bin/env bash
echo $myPath

you'll get the desired results.

你会得到想要的结果。

#3

You could also do this to set the myPath variable just for myscript

您也可以这样设置myPath变量仅用于myscript

myPath="whatever" ./myscript

For details of the admitted tricky syntax for environment variables see: http://www.pixelbeat.org/docs/env.html

有关环境变量的公认棘手语法的详细信息,请参阅:http://www.pixelbeat.org/docs/env.html

#4

You must declare your variable assignment with "export" as such:

您必须使用“export”声明您的变量赋值:

export myPath="/home/user/dir"

This will cause the shell to include the variable in the environment of subprocesses it launches. By default, variables you declare (without "export") are not passed to a subprocess. That is why you did not initially get the result you expected.

这将导致shell将变量包含在它启动的子进程的环境中。默认情况下,您声明的变量(没有“export”)不会传递给子流程。这就是为什么你最初没有得到你期望的结果。